Question

An IP packet has arrived with the first 8 bits as 01000010. What is the version?

(a) 3

(b) 4

(c) 5

(d) 6

This question was addressed to me at a job interview.

This intriguing question originated from IP Datagram Packet in section Internet Protocol, Network Addressing and Transport Level Security of Cryptograph & Network Security

Answer 1

Right answer is (b) 4

Easy explanation: The first 4-bits show the version i.e. 0100 -> version 4.